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were sometimes before colored chars

- toggle const hide_unplayed = false;
- Todo : toggle button

- usefull when bar is too small to get its tooltip
- greyed out icon when data is missing (usefull to differentiate "0% bar because I lost all games with this character" vs "0% bar because I never played this character")
- tooltips uniformization

- added pie charts for character usage (player and opponent)
- added characters colors for pie charts
- pie sections are grouped if < 1% (configurable in character_pie_chart : minPercent) so the graph stays readable
- Smash logo icon added for this group, named "Others"

- uniformisation (usage bar chart player/opponent refactoring, tooltips formating)
- added titles to Evolution's graphs

- TODO toggle pie/bar chart (for now it's just a hardocded toggle : const bar_chart in overall.js) : I don't know how to make a button yet...

Before: The tooltip is positioned according to which element the cursor is on ; text or rect. If cursor moves from text to rect (or vice versa), the tooltip is slighly moved.
Now: The tooltip is always positioned to the rect element, whether the cursor is on text or rect element. The tooltip is not moving anymore.

- added tooltip on Evolution > Monthly winrate
- added tootip on Matchups tiles
- added axis titles on Matchups

Implements #11
Implements #2